kowshik commented on a change in pull request #9001: URL: https://github.com/apache/kafka/pull/9001#discussion_r494179911
########## File path: clients/src/main/java/org/apache/kafka/clients/admin/FeatureMetadata.java ########## @@ -0,0 +1,103 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.kafka.clients.admin; + +import java.util.Objects; +import java.util.Optional; +import org.apache.kafka.common.feature.Features; +import org.apache.kafka.common.feature.FinalizedVersionRange; +import org.apache.kafka.common.feature.SupportedVersionRange; + +/** + * Encapsulates details about finalized as well as supported features. This is particularly useful + * to hold the result returned by the {@link Admin#describeFeatures(DescribeFeaturesOptions)} API. + */ +public class FeatureMetadata { + + private final Features<FinalizedVersionRange> finalizedFeatures; + + private final Optional<Integer> finalizedFeaturesEpoch; + + private final Features<SupportedVersionRange> supportedFeatures; + + public FeatureMetadata(final Features<FinalizedVersionRange> finalizedFeatures, + final int finalizedFeaturesEpoch, + final Features<SupportedVersionRange> supportedFeatures) { + Objects.requireNonNull(finalizedFeatures, "Provided finalizedFeatures can not be null."); + Objects.requireNonNull(supportedFeatures, "Provided supportedFeatures can not be null."); + this.finalizedFeatures = finalizedFeatures; + if (finalizedFeaturesEpoch >= 0) { + this.finalizedFeaturesEpoch = Optional.of(finalizedFeaturesEpoch); + } else { + this.finalizedFeaturesEpoch = Optional.empty(); + } + this.supportedFeatures = supportedFeatures; + } + + /** + * A map of finalized feature versions, with key being finalized feature name and value + * containing the min/max version levels for the finalized feature. + */ + public Features<FinalizedVersionRange> finalizedFeatures() { + return finalizedFeatures; + } + + /** + * The epoch for the finalized features. + * If the returned value is empty, it means the finalized features are absent/unavailable. + */ + public Optional<Integer> finalizedFeaturesEpoch() { Review comment: Done. I've updated the KIP to use `Optional<Integer>` as well. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
